feat: add app-owned YouTube subtitle flow with absPlayer-style parsing (#31)

* fix: harden preload argv parsing for popup windows

* fix: align youtube playback with shared overlay startup

* fix: unwrap mpv youtube streams for anki media mining

* docs: update docs for youtube subtitle and mining flow

* refactor: unify cli and runtime wiring for startup and youtube flow

* feat: update subtitle sidebar overlay behavior

* chore: add shared log-file source for diagnostics

* fix(ci): add changelog fragment for immersion changes

* fix: address CodeRabbit review feedback

* fix: persist canonical title from youtube metadata

* style: format stats library tab

* fix: address latest review feedback

* style: format stats library files

* test: stub launcher youtube deps in CI

* test: isolate launcher youtube flow deps

* test: stub launcher youtube deps in failing case

* test: force x11 backend in launcher ci harness

* test: address latest review feedback

* fix(launcher): preserve user YouTube ytdl raw options

* docs(backlog): update task tracking notes

* fix(immersion): special-case youtube media paths in runtime and tracking

* feat(stats): improve YouTube media metadata and picker key handling

* fix(ci): format stats media library hook

* fix: address latest CodeRabbit review items

* docs: update youtube release notes and docs

* feat: auto-load youtube subtitles before manual picker

* fix: restore app-owned youtube subtitle flow

* docs: update youtube playback docs and config copy

* refactor: remove legacy youtube launcher mode plumbing

* fix: refine youtube subtitle startup binding

* docs: clarify youtube subtitle startup behavior

* fix: address PR #31 latest review follow-ups

* fix: address PR #31 follow-up review comments

* test: harden youtube picker test harness

* udpate backlog

* fix: add timeout to youtube metadata probe

* docs: refresh youtube and stats docs

* update backlog

* update backlog

* chore: release v0.9.0

src/config/definitions/options-integrations.ts

@@ -369,43 +369,47 @@ export function buildIntegrationConfigOptionRegistry(
       path: 'youtubeSubgen.whisperBin',
       kind: 'string',
       defaultValue: defaultConfig.youtubeSubgen.whisperBin,
-      description: 'Path to whisper.cpp CLI used as fallback transcription engine.',
+      description: 'Legacy compatibility path kept for external subtitle fallback tools; not used by default.',
     },
     {
       path: 'youtubeSubgen.whisperModel',
       kind: 'string',
       defaultValue: defaultConfig.youtubeSubgen.whisperModel,
-      description: 'Path to whisper model used for fallback transcription.',
+      description: 'Legacy compatibility model path kept for external subtitle fallback tooling; not used by default.',
     },
     {
       path: 'youtubeSubgen.whisperVadModel',
       kind: 'string',
       defaultValue: defaultConfig.youtubeSubgen.whisperVadModel,
-      description: 'Path to optional whisper VAD model used for subtitle generation.',
+      description:
+        'Legacy compatibility VAD path kept for external subtitle fallback tooling; not used by default.',
     },
     {
       path: 'youtubeSubgen.whisperThreads',
       kind: 'number',
       defaultValue: defaultConfig.youtubeSubgen.whisperThreads,
-      description: 'Thread count passed to whisper.cpp subtitle generation runs.',
+      description: 'Legacy thread tuning for subtitle fallback tooling; not used by default.',
     },
     {
       path: 'youtubeSubgen.fixWithAi',
       kind: 'boolean',
       defaultValue: defaultConfig.youtubeSubgen.fixWithAi,
-      description: 'Use shared AI provider to post-process whisper-generated YouTube subtitles.',
+      description:
+        'Legacy subtitle fallback post-processing switch kept for compatibility; use is currently disabled by default.',
     },
     {
       path: 'youtubeSubgen.ai.model',
       kind: 'string',
       defaultValue: defaultConfig.youtubeSubgen.ai.model,
-      description: 'Optional model override for YouTube subtitle AI post-processing.',
+      description:
+        'Optional model override for legacy subtitle fallback post-processing; not used by default.',
     },
     {
       path: 'youtubeSubgen.ai.systemPrompt',
       kind: 'string',
       defaultValue: defaultConfig.youtubeSubgen.ai.systemPrompt,
-      description: 'Optional system prompt override for YouTube subtitle AI post-processing.',
+      description:
+        'Optional system prompt override for legacy subtitle fallback post-processing; not used by default.',
     },
     {
       path: 'youtubeSubgen.primarySubLanguages',